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Photothermal induced resonance (PTIR) absorption imaging reveals the nanocontaminant distribution within van der Waals heterostructures (vdWHs). Simultaneously measured (a) topography and (b) PTIR relative absorption maps (Si–O–Si stretch of PDMS, 1026 cm−1) obtained on vdWHs consisting of WSe2/hBN flakes assembled using the water-assisted PDMS pick-up and transfer method. Scale bars represent 1 μm.
